Use fluid setters for DatabaseConfig and DatabaseBuilder

ebean-api/src/main/java/io/ebean/Database.java

@@ -86,6 +86,23 @@ import java.util.concurrent.Callable;
 @NonNullApi
 public interface Database {
 
+  /**
+   * Return a new database builder.
+    * <pre>{@code
+ *
+ *   // build the 'default' database using configuration
+ *   // from application.properties / application.yaml
+ *
+ *   Database db = Database.builder()
+ *     .loadFromProperties()
+ *     .build();
+ *
+ * }</pre>
+   */
+  static DatabaseBuilder builder() {
+    return new DatabaseConfig();
+  }
+
   /**
    * Shutdown the Database instance.
    */